Need help will give you the brainliest

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

Ill mark the brainliest if you me with the these three questions 7,8,9

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20